The list of ship commissionings in 1891 includes a chronological list of all ships commissioned in 1891.
| Operator | Ship | Flag | Class and type | Pennant | Other notes | |
|---|---|---|---|---|---|---|
| 17 April | United States Navy | Chicago | Protected cruiser | |||
| 18 April | Marceau[1] | Marceau-class ironclad | ||||
| 30 June |  | Passenger/cargo ship | ||||
| 30 June | Nile[2] | Trafalgar-class battleship | ||||
| 8 July | San Pareil | Victoria-class battleship | ||||